Max RPM

^^^^^^^^ What he said is spot on ^^^^^^^^^
Ditto!

At 450 RWHP, your ceiling, this translates to a 500+ hp engine. You can do this under 6700 RPMs.
750, rpm, trick flow heads, zero decked slugs.
RAMM dyno’d a 360 to 541 HP @ 6700, though he used a Super Victor, IMO, you would still make over 500 with the rpm intake. This is the cam he used and it would deliver. I would suggest 1.6 rockers since it would help lift the valve a bit more and take advantage of the cylinder head better.

20-248-4 - Magnum™ Mechanical Flat Tappet Camshafts